Adaptive optics systems for high power gas lasers and solid state lasers are reviewed. Large scale deformablemirrors with magnetostrict actuators were cooled by water for use with huge output infrared lasers. The simplemirrors which are deformable by the hydro pressure were applied to adaptive resonators for thermal lenscompensation with solid state lasers. A silicon wafer mirror was proposed as an automatic adaptive resonatorfor LD-pumped YAG lasers. New techniques employing a spatial phase modulator, phase-conjugated mirrors, and hybrid laser crystals are introduced.
